When the app is maximized, the hidden taskbar cannot be triggered.

[lgBlog]

Describe the bug

The taskbar is set to auto-hide. When the app is set to maximized, the taskbar does not appear when the mouse is moved to the bottom of the screen

Steps to reproduce the bug

1.Create a new empty WinUI3 application.
2.Extend the content to the title bar.

      AppWindowTitleBar titleBar = this.AppWindow.TitleBar; 
      titleBar.ExtendsContentIntoTitleBar = true;
      titleBar.ButtonBackgroundColor = Colors.Transparent;
      titleBar.ButtonInactiveBackgroundColor = Colors.Transparent;

3.Set the taskbar to hidden mode.
4.Maximize the app
5. Move the mouse to the bottom of the screen

Expected behavior

The hidden taskbar will be shown

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.2.5: 1.2.230313.1

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response

[yair100]

This is still an issue in Windows App SDK 1.3.1

[yair100]

Are there any updates on this issue? We're getting a lot of complaints from users.

[AgentRBY]

Any updates?

[BreeceW]

Here is a workaround:

C#

[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
static extern bool SetPropW(IntPtr hWnd, string lpString, IntPtr hData);
...
var hWnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
SetPropW(hWnd, "NonRudeHWND", new IntPtr(1));

C++

#include <microsoft.ui.xaml.window.h>
...
const auto windowNative{ this->try_as<IWindowNative>() };
HWND hWnd{};
windowNative->get_WindowHandle(&hWnd);
SetPropW(hWnd, L"NonRudeHWND", reinterpret_cast<HANDLE>(TRUE));

The NonRudeHWND property is documented here. Remember to call RemovePropW when the window is closing.

[yair100]

@BreeceW thank you for the workaround. Looks like it did the trick.